diff options
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 49 | ||||
| -rw-r--r-- | include/linux/cpuidle.h | 2 | ||||
| -rw-r--r-- | kernel/sched/idle.c | 56 |
3 files changed, 56 insertions, 51 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 1506d69b3f0f..166a7322a2b6 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -173,55 +173,6 @@ void cpuidle_reflect(struct cpuidle_device *dev, int index) } /** - * cpuidle_idle_call - the main idle loop - * - * NOTE: no locks or semaphores should be used here - * return non-zero on failure - */ -int cpuidle_idle_call(void) -{ - struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); - struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); - int next_state, entered_state, ret; - bool broadcast; - - ret = cpuidle_enabled(drv, dev); - if (ret < 0) - return ret; - - /* ask the governor for the next state */ - next_state = cpuidle_select(drv, dev); - - if (need_resched()) { - dev->last_residency = 0; - /* give the governor an opportunity to reflect on the outcome */ - cpuidle_reflect(dev, next_state); - local_irq_enable(); - return 0; - } - - broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP); - - if (broadcast && - clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu)) - return -EBUSY; - - trace_cpu_idle_rcuidle(next_state, dev->cpu); - - entered_state = cpuidle_enter(drv, dev, next_state); - - trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu); - - if (broadcast) - clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); - - /* give the governor an opportunity to reflect on the outcome */ - cpuidle_reflect(dev, entered_state); - - return 0; -} - -/** * cpuidle_install_idle_handler - installs the cpuidle idle loop handler */ void cpuidle_install_idle_handler(void) diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index accc2dd72049..8d97962d6d64 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -128,7 +128,6 @@ extern int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index); extern void cpuidle_reflect(struct cpuidle_device *dev, int index); -extern int cpuidle_idle_call(void); extern int cpuidle_register_driver(struct cpuidle_driver *drv); extern struct cpuidle_driver *cpuidle_get_driver(void); extern struct cpuidle_driver *cpuidle_driver_ref(void); @@ -160,7 +159,6 @@ static inline int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index) {return -ENODEV; } static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { } -static inline int cpuidle_idle_call(void) { return -ENODEV; } static inline int cpuidle_register_driver(struct cpuidle_driver *drv) {return -ENODEV; } static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index b7976a127178..d5aaf5eb4531 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -63,6 +63,62 @@ void __weak arch_cpu_idle(void) local_irq_enable(); } +#ifdef CONFIG_CPU_IDLE +/** + * cpuidle_idle_call - the main idle function + * + * NOTE: no locks or semaphores should be used here + * return non-zero on failure + */ +static int cpuidle_idle_call(void) +{ + struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); + struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); + int next_state, entered_state, ret; + bool broadcast; + + ret = cpuidle_enabled(drv, dev); + if (ret < 0) + return ret; + + /* ask the governor for the next state */ + next_state = cpuidle_select(drv, dev); + + if (need_resched()) { + dev->last_residency = 0; + /* give the governor an opportunity to reflect on the outcome */ + cpuidle_reflect(dev, next_state); + local_irq_enable(); + return 0; + } + + broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP); + + if (broadcast && + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu)) + return -EBUSY; + + trace_cpu_idle_rcuidle(next_state, dev->cpu); + + entered_state = cpuidle_enter(drv, dev, next_state); + + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu); + + if (broadcast) + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); + + /* give the governor an opportunity to reflect on the outcome */ + cpuidle_reflect(dev, entered_state); + + return 0; +} +#else +static inline int cpuidle_idle_call(void) +{ + return -ENODEV; +} +#endif + /* * Generic idle loop implementation */ |